In September last year, Microsoft launched Planner, a project management/team collaboration app, as a part of its Office 365 suite of applications. Originally available only to select customers, Planner is now available to all Office 365 users for free. If you’re familiar with Trello, you’ll immediately know what Planner is about, as it lets you organize projects into “buckets,” collections of individual tasks you can easily drag and drop from one bucket to another. SEE…